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dc.contributor.author | Li, HuaJun![]() |
en |
dc.contributor.author | Yang, Zhiyin![]() |
en |
dc.date.accessioned | 2017-08-28T07:07:43Z | |
dc.date.available | 2017-08-28T07:07:43Z | |
dc.date.issued | 2016 | en |
dc.description | Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016. | en |
dc.description.abstract | Large-eddy simulation (LES) is conducted to study the transition process of a separated boundary layer on a flat plate with an elliptical leading edge. A streamwise pressure distribution is imposed and the free stream turbulence intensity is 3% to mimic the suction surface of a low-pressure turbine (LPT) blade. A dynamic sub-grid scale model is employed in the study and the current LES results compare well with available experimental data and previous LES results. The transition process has been analysed with a particular focus on primary instabilities at work. Streaky structures further upstream of the separation, known as the Klebanoff Streaks, have been observed. Typical two-dimensional Kelvin-Helmholtz (K-H) rolls are distorted in the separated region. When Klebanoff streaks passing over a full-span K-H roll, portion of the two-dimensional roll merges with the Klebanoff streaks and develop into chaotic three-dimensional structures, whereas the remaining undisrupted two-dimensional K-H rolls develop into Λ-vortex indicating that despite the disturbances before separation, the K-H instability may still be the main instability at work. | en |
dc.format.extent | 6 pages | en |
dc.format.medium | en | |
dc.identifier.uri | http://hdl.handle.net/2263/61901 | |
dc.language.iso | en | en |
dc.publisher | HEFAT | en |
dc.rights | University of Pretoria | en |
dc.subject | Pressure gradient | en |
dc.subject | Separated boundary layer transition | en |
dc.title | Numerical study of separated boundary layer transition under pressure gradient | en |
dc.type | Presentation | en |